Help designing radiant heat setup for 40 x 60 workshop

[hellspcangel911]

Hi All,
I’m in the process of getting the heating sorted for my workshop. I was hoping I could get some advice on my setup before I order the components. When I poured the slab I ran 7 loops of 1/2 “ pex, each about 300’ in anticipation of running a propane boiler.
It’s a steel building, 40 x 60, R-13 in the walls, R-19 for the roof, one large 12x14 door, two 8x9 doors. Its located in CT, looking to keep it around 55-60 degrees in the winter.
There is a 25 x30 loft on one side that will be additionally insulated and serve as an office. I’m hoping to run this as a separate heated zone off the same boiler.
So I’ looking at the Viessmann Vitodens 100-W B1HE-120 with a Caleffi 547 Series 1 ¼ hydraulic separator, Garage slab pump Grundfos Alpha1 15-55 and the Loft baseboard would use a Taco 007-F.
Any feedback or suggestions would be greatly appreciated.

Thank you

 

[fitter30]

67200 btu's, 7gpm@ 9'+2' = 11' head for loops
Micro bubbler for air removal, bladder tank for expansion, primary secondary loops with pex manifolds with flow meters. Glycol for boilers Not Automotive 30% minimum 50% max. This glycol needs 30% for the additive package and 50% is for pump efficiency. This. Glycol will protect either for freeze protection or slush manufacturer will have charts for both.
Boiler don't need or want a 199k boiler.
Standard fin tube/ aor handler is a problem they don't really start heating till water is 120° at 0° outside might need 160° or 180° that is to hot for radiate which runs 80°- 90. Condensing boilers have to run under 140° return water for the 95%+ efficiency. Colder the better. They do make fin tube for colder water. Just one brand
www.sterlingbaseboard.com/Synergy.html